OpenGL rendering of Qt widgets

[Luc4]

Hi! I read a message in a Qt forum that stated that Qt widgets built in C++ are rendered differently than widgets written in the QML language when using OpenGL. The C++ widgets are rendered first using the raster engine and than rendered in OpenGL, while QML widgets are fully accelerated.

Is this correct? Aren't QML widgets the same as the common C++ widgets? Why there is such a difference? Can't I reach the same performance of QML in C++ when rendering using OpenGL (talking about Qt for Linux Embedded)?

Thanks!